Floor heat

N

nizak

Senior Member
Any thoughts on the following.
240 volt floor heat that has been operational for 5 years.

Abruptly stopped.
Ohms readings are within Mfgr specs
Voltage input correct.
T-stat was swapped with one that’s operational in another part of the house.. Did not heat with that either.

Haven’t seen the job. This info is from the owner who had a reputable electrician look at the situation.

Thanks
 
Are you sure the GFCI within the thermostat is not tripping?

Have you verified the circuit is delivering 240 volts when under load?

Try temporarily bypassing the thermostat and take amp readings.
 
Something you’re being told is not correct. If the resistance is correct and 240V is measured at the same point resistance is being measured at, it has to heat. I suspect the voltage is being measured at the control input, not at the heating input.
 
curt swartz said:
Are you sure the GFCI within the thermostat is not tripping?

Have you verified the circuit is delivering 240 volts when under load?

Try temporarily bypassing the thermostat and take amp
Click to expand...
curt swartz said:
Are you sure the GFCI within the thermostat is not tripping?

Have you verified the circuit is delivering 240 volts when under load?

Try temporarily bypassing the thermostat and take amp readings.
Click to expand...
Thank you.
 
retirede said:
Something you’re being told is not correct. If the resistance is correct and 240V is measured at the same point resistance is being measured at, it has to heat. I suspect the voltage is being measured at the control input, not at the heating input.
Click to expand...
Would heating input be the load side of the the T-stat?
 
All the thermostats I have installed are marked Line & Load. I have no idea what "heating input" would mean. You are not sending heat to the thermostat.
 
nizak said:
Abruptly stopped.
Ohms readings are within Mfgr specs
Voltage input correct.
T-stat was swapped with one that’s operational in another part of the house.. Did not heat with that either.

Haven’t seen the job. This info is from the owner who had a reputable electrician look at the situation.

Thanks
Click to expand...
How can this be that complicated? 5min and a DMM should find the issue without guessing. Current drops to nothing but still have voltage on the load side = heat element is highly suspect unless terminations are smoked.
 
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